National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

A Few Clouds

97°F

36°C

Humidity 42%
Wind Speed S 15 mph
Barometer 29.86 in (1010.0 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index104°F (40°C)
Last update 12 Aug 6:56 pm CDT
Extended Forecast for

Lockhart TX

  • Tonight

    Tonight: Mostly clear, with a low around 76. South wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 76 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny and hot, with a high near 102. Heat index values as high as 108. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 102 °F

    Hot

  • Thursday Night

    Thursday Night: Increasing clouds, with a low around 77. South southeast wind 10 to 20 mph, with gusts as high as 25 mph.

    Low: 77 °F

    Increasing
    Clouds

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 99. Heat index values as high as 106. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 99 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: Partly cloudy, with a low around 77. South wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 77 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny and hot, with a high near 100. South southeast wind 5 to 10 mph.

    High: 100 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 74. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 74 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny and hot, with a high near 100. Calm wind becoming south southeast around 5 mph in the afternoon.

    High: 100 °F

    Hot

  • Sunday Night

    Sunday Night: Clear, with a low around 74. Southeast wind 5 to 10 mph becoming south southwest after midnight. Winds could gust as high as 20 mph.

    Low: 74 °F

    Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 76. South wind 10 to 15 mph, with gusts as high as 25 mph.
Thursday
Mostly sunny and hot, with a high near 102. Heat index values as high as 108. South wind 10 to 15 mph, with gusts as high as 25 mph.
Thursday Night
Increasing clouds, with a low around 77. South southeast wind 10 to 20 mph, with gusts as high as 25 mph.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 99. Heat index values as high as 106. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.
Friday Night
Partly cloudy, with a low around 77. South wind 5 to 15 mph, with gusts as high as 20 mph.
Saturday
Mostly sunny and hot, with a high near 100. South southeast wind 5 to 10 mph.
Saturday Night
Mostly clear, with a low around 74. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.
Sunday
Mostly sunny and hot, with a high near 100. Calm wind becoming south southeast around 5 mph in the afternoon.
Sunday Night
Clear, with a low around 74. Southeast wind 5 to 10 mph becoming south southwest after midnight. Winds could gust as high as 20 mph.
Monday
Sunny and hot, with a high near 100.
Monday Night
Mostly clear, with a low around 76.
Tuesday
Sunny and hot, with a high near 101.
Tuesday Night
Mostly clear, with a low around 76.
Wednesday
Sunny and hot, with a high near 101.
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ABOUT THIS FORECAST

 
Point Forecast:
Lockhart TX
 29.88°N 97.68°W (Elev. 525 ft)
Last Update:
6:46 pm CDT Aug 12, 2026
Forecast Valid:
7pm CDT Aug 12, 2026-6pm CDT Aug 19, 2026
 
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Additional Resources

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Chance of Precipitation